Abstract
Western Qaidam basin which was confined by two boundary zones of Eastern Kunlun and Altin zones endured two phases of tectonic movement during the Cenozoic. Complex in depositional fillings and structure deformations hinders the judgment for early Himalayan effective traps, which lead to troubles in choosing for exploration targets. To solve these problems, regional sequence stratigraphy correlations on seismic and logs data were performed. Then, based on core, logs, and cuttings of wells, lithology and sedimentary facies were identified. In the region of non-well, two dimensions (2D) seismic facies interpretation and well-to-seismic integration method were used to depict the sedimentary systems and their distributions on the plane. Two tectonostratigraphies of Early Himalayan cycle with pan-lake facies and late Himalayan cycle with alluvial-braided river facies were, respectively, recognized by the faces variance sharply and basins superimposition characters. And then by backstrip technique in assistance of 2D fault combination, thickness variance, and seismic facies, two kinds of reversion structures can be identified. One is the reversion in fault dip direction of large boundary faults when geotectonic setting varied. Another is the reversion of basement by warping and plastic flow of deep geological structure during later Himalayan movement, and the deposition centers shifted from west to the east parallel to strike-slip faults of East Kunlun belts. Finally, by seismic interpretation, paleo-structure maps, and facies distribution, faulted anticlines, faulted noses, paleo-high, paleo-clinoforms of early Himalayan stage, and compressive anticlines of late Himalayan period were delineated and they constituted traps diversity of this area. Discerning two types of inversion structures and paleo-traps could contribute to recover the direction and paths of oil migration and enhance the evaluation of favorable targets.
Copyright 2018, Shaanxi Petroleum Society.
This paper was prepared for presentation at the 2018 International Field Exploration and Development Conference in Xi’an, China, September 18-20, 2018.
This paper was selected for presentation by the IFEDC Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the IFEDC Committee and are subject to correction by the author(s). The material does not necessarily reflect any position of the IFEDC Committee, its members. Papers presented at the Conference are subject to publication review by Professional Committee of Petroleum Engineering of Shaanxi Petroleum Society. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of Shaanxi Petroleum Society are prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of IFEDC. Contact email: paper@ifedc.org.
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Acknowledgements
This research was supported by a grant from PetroChina Company Limited. Qinhai oil field company was appreciated for providing research data for the study. We are grateful to Lingshan Liu and Zhiye Zhang for taking part in groundwork like mapping. The authors also thank Shuichang Zhang, Mengjun Zhao, Rukai Zhu, Aiguo Su, and Dade Ma for stimulating discussions.
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Guihong, W., Zhiyong, C., Chuanmin, Z., Jietang, L., Ming, Z., Dianao, W. (2020). Analysis of Inversion Structure and Trap Diversity in a Block of Western Qaidam Basin. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2018. IFEDC 2018. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-13-7127-1_19
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